Chitosan application on differently pretreated cotton fibres [Elektronski vir]
Jazbec, Anita ...
Chitosan is partially or fully N-deacetylated chitin and is a copolymer of ß-1,4-0Glucosamine and N-Acetyl-1,4-0-Glucosamine. Since chitosan has unique physiological and biological properties, it is ...regarded as a material for biomedical and biopharmaceutical, biochemical and hygienic, microbiological, environmental and food products. Chitosan-coated cotton fibres are used in a number of medical applications such as antimicrobial or antibacterial agents, wound healing, blood anti-coagulants (heparinoids), a drug delivery systems, an absorbable sutures, an anti-tumour agents, a hemostatic and anti-thrombogenic agents and as antidermatitis agents. Relatively poor fixation of chitosan on cotton fibres stili presents a problem. To improve fixation is necessary to assure enough reducing aldehyde groups without worsening of fibres' mechanical properties. Aim of this research was systematic investigation of correlation between oxidation degree, chitosan fixation and mechanical and sorption properties of cotton fibres. Pretreated (alkali pre-treatment, bleaching, demineralization) cotton fibres we re applied. Different oxidation degrees of fibres were achieved by varying the treatment time and concentration of KIO4. The amount of reducing aldehyde groups was followed using spectrophotometric method. Oxidized and raw cotton fibres were impregnated by chitosan with low (M-150 000) and high (M-400 000) molecular weight. Conventional mechanical (Iinear density, breaking force, breaking elongation, tenacity, initial (young's) modulus) and adsorption properties of fibre samples were evaluated. Capillary velocity and contact angle between fibre surface and water were determined using powder contact angle method of tensiometry.
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